<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <title> onmouseover-onmouseout </title>
</head>

<body>
    <div onmouseover="mOver(this)" onmouseout="mOut(this)" 
	    style="background-color:green;
	    width:120px;
	    height:20px;
	    padding:40px;
	    color:#ffffff;">
	    把鼠标移到上面
	</div>

<script>
	function mOver(obj){
		obj.innerHTML ="谢谢"
	}
	function mOut(obj) {
		obj.innerHTML="把鼠标移到上面"
	}
</script>
</body>

</html>